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Process for preparing highly-hydrophilic alumina film material

A technology of hydrated alumina and membrane materials, applied in the field of material chemistry, to achieve the effects of controllable morphology, convenient large-scale promotion and high stability

Inactive Publication Date: 2009-02-11
BEIJING ZHONGKE NANO THINK PRINT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The method research patents related to porous alumina are found in CN03136606.6, CN200310111834.1, CN200410064921.0, CN200510007195.3, CN200510018403.x. As a hydrophilic material, there are no literature and patent reports

Method used

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  • Process for preparing highly-hydrophilic alumina film material
  • Process for preparing highly-hydrophilic alumina film material
  • Process for preparing highly-hydrophilic alumina film material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1) Pretreatment: Cut out a high-purity aluminum foil with a purity of 99.999% (purchased from the Beijing Institute of Nonferrous Metals) in an appropriate shape and size, ultrasonically clean it with ethanol and acetone for 30 minutes and 10 minutes, respectively, and then wash it in perchloric acid / ethanol ( v / v, 1 / 5) electrochemically polished in the solution until the surface of the aluminum foil is as smooth as a mirror, and then simply rinsed with water for 1-2 times.

[0040] 2) The first step of anodizing: the aluminum foil obtained in step 1) is used as the anode, and the platinum sheet is used as the cathode, in 0.2M oxalic acid, at a voltage of 40V, the first step of anodizing is performed when the ambient temperature is less than 15°C for 12 hours or so.

[0041] 3) Erosion of the one-step oxide film: soak the aluminum foil in step 2) in a mixture of 6wt% phosphoric acid and 1.8wt% chromic acid in a 65°C water bath for 8-10 hours.

[0042] 4) The second ste...

Embodiment 2

[0047] 1) Pretreatment: Cut out a high-purity aluminum foil with a purity of 99.999% in an appropriate shape and size, ultrasonically clean it with ethanol and acetone for 30 minutes and 10 minutes, respectively, and wash it in perchloric acid / ethanol (v / v, 1 / 5) solution Electrochemical polishing until the surface of the aluminum foil is as smooth as a mirror, and then simply rinsed with water for 1 or 2 times.

[0048] 2) The first step of anodizing: the aluminum foil obtained in step 1) is used as the anode, and the platinum sheet is used as the cathode. In 0.2M oxalic acid, at a voltage of 45V, the first step of anodizing is performed when the ambient temperature is less than 15°C. 11.5 hours or so.

[0049] 3) Erosion of the one-step oxide film: soak the aluminum foil in step 2) in a mixture of 6wt% phosphoric acid and 1.8wt% chromic acid in a 65°C water bath for 8-10 hours.

[0050] 4) The second step of anodic oxidation: the aluminum foil peeled off in step 3) was subje...

Embodiment 3

[0055] 1) Pretreatment: Cut out a high-purity aluminum foil with a purity of 99.999% in an appropriate shape and size, ultrasonically clean it with ethanol and acetone for 30 minutes and 10 minutes, respectively, and wash it in perchloric acid / ethanol (v / v, 1 / 5) solution Electrochemical polishing until the surface of the aluminum foil is as smooth as a mirror, and then simply rinsed with water for 1 or 2 times.

[0056] 2) The first step of anodizing: the aluminum foil obtained in step 1) is used as the anode, the platinum sheet is used as the cathode, and the first step of anodizing is performed in 0.2M oxalic acid at a voltage of 50V and the ambient temperature is less than 15°C. hours or so.

[0057] 3) Erosion of the one-step oxide film: soak the aluminum foil in step 2) in a mixture of 6wt% phosphoric acid and 1.8wt% chromic acid in a 65°C water bath for 8-10 hours.

[0058] 4) The second step of anodic oxidation: the aluminum foil peeled off in step 3) was subjected to ...

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Abstract

The invention discloses a making method of high-hydrophilicity alumina film, which comprises the following steps: adopting electrochemical polished aluminium foil as anode and platinum piece as cathode; selecting one of sulfuric acid, oxalic acid phosphoric acid with water or poor water (the composite solution of oxalic alcohol and water) as electrolyte solution; using electrochemical oxidizing method to strip aluminium base; removing damping layer; obtaining the product with different shapes and areas.

Description

technical field [0001] The invention belongs to the field of material chemistry, in particular to a method for preparing a highly hydrophilic aluminum oxide film material by an anodic oxidation method. Background technique [0002] As a class of widely used materials, hydrophilic materials have attracted the attention of many researchers. In the past, the preparation methods of hydrophilic materials mostly used surface coating or surface solvent modification to obtain a hydrophilic surface or plate. The surface composition obtained in this way is not uniform, and the property difference is relatively large, and it cannot be applied to relatively large materials. Preparation of thin and even ultrathin membrane materials. Until 1995, MASUDA and others invented the two-step oxidation method (Science, 1995, 268, 1466-1468), and prepared a large-area and highly ordered porous alumina membrane material with a honeycomb structure, which further made the alumina membrane material w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/42
Inventor 张佑专张玉琦宋延林江雷
Owner BEIJING ZHONGKE NANO THINK PRINT TECH
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